Merge pull request #440 from fitzgen/build-profiles-toml-config

Add three build profiles and infrastructure for their toml config
7 years ago · 51e6351c28
parent 91e3293529 64d52d8735
commit 51e6351c28
11 changed files with 464 additions and 65 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@ -181,10 +181,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
 "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
 "clicolors-control 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
 "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "termios 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -205,10 +205,10 @@ dependencies = [

 [[package]]
 name = "curl"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "curl-sys 0.4.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "curl-sys 0.4.15 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -220,7 +220,7 @@ dependencies = [

 [[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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@ -264,15 +264,15 @@ name = "failure_derive"
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- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
 "syn 0.15.18 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
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@ -389,11 +389,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"

 [[package]]
 name = "lazy_static"
-version = "1.1.0"
+version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
-]

 [[package]]
 name = "libc"
@ -493,7 +490,7 @@ dependencies = [
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- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -528,7 +525,7 @@ name = "os_type"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "regex 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
@ -572,7 +569,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"

 [[package]]
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@ -580,10 +577,10 @@ dependencies = [

 [[package]]
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+ "proc-macro2 0.4.21 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
@ -659,12 +656,12 @@ dependencies = [

 [[package]]
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@ -679,7 +676,7 @@ dependencies = [

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@ -716,7 +713,7 @@ name = "schannel"
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- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -754,8 +751,8 @@ name = "serde_derive"
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@ -845,8 +842,8 @@ version = "0.2.13"
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- "quote 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -855,8 +852,8 @@ name = "syn"
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- "quote 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -865,8 +862,8 @@ name = "synstructure"
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@ -878,10 +875,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"

 [[package]]
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@ -957,7 +954,7 @@ name = "thread_local"
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 [[package]]
@ -1047,14 +1044,14 @@ dependencies = [
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@ -1065,7 +1062,7 @@ dependencies = [
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 "checksum syn 0.15.18 (registry+https://github.com/rust-lang/crates.io-index)" = "90c39a061e2f412a9f869540471ab679e85e50c6b05604daf28bc3060f75c430"
 "checksum synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "73687139bf99285483c96ac0add482c3776528beac1d97d444f6e91f203a2015"
 "checksum take_mut 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f764005d11ee5f36500a149ace24e00e3da98b0158b3e2d53a7495660d3f4d60"
-"checksum tar 0.4.17 (registry+https://github.com/rust-lang/crates.io-index)" = "83b0d14b53dbfd62681933fadd651e815f99e6084b649e049ab99296e05ab3de"
+"checksum tar 0.4.18 (registry+https://github.com/rust-lang/crates.io-index)" = "89b518542272d9c12195e72885c7a4c142b89226f681bb129e4a922ba1b1ee74"
 "checksum tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)" = "15f2b5fb00ccdf689e0149d1b1b3c03fead81c2b37735d812fa8bddbbf41b6d8"
 "checksum tempfile 3.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "55c1195ef8513f3273d55ff59fe5da6940287a0d7a98331254397f464833675b"
 "checksum term 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "5e6b677dd1e8214ea1ef4297f85dbcbed8e8cdddb561040cc998ca2551c37561"
--- a/docs/src/SUMMARY.md
+++ b/docs/src/SUMMARY.md
@ -18,4 +18,5 @@
    - [`src/utils.rs`](./tutorial/template-deep-dive/src-utils-rs.md)
  - [Packaging and Publishing](./tutorial/packaging-and-publishing.md)
  - [Using your Library](./tutorial/using-your-library.md)
+- [`Cargo.toml` Configuration](./cargo-toml-configuration.md)
 - [Contributing](./contributing.md)
--- a/docs/src/cargo-toml-configuration.md
+++ b/docs/src/cargo-toml-configuration.md
@ -0,0 +1,29 @@
+# `Cargo.toml` Configuration
+
+`wasm-pack` can be configured via the `package.metadata.wasm-pack` key in
+`Cargo.toml`. Every option has a default, and is not required.
+
+There are three profiles: `dev`, `profiling`, and `release`. These correspond to
+the `--dev`, `--profiling`, and `--release` flags passed to `wasm-pack build`.
+
+The available configuration options and their default values are shown below:
+
+```toml
+[package.metadata.wasm-pack.profile.dev.wasm-bindgen]
+# Should we enable wasm-bindgen's debug assertions in its generated JS glue?
+debug-js-glue = true
+# Should wasm-bindgen demangle the symbols in the "name" custom section?
+demangle-name-section = true
+# Should we emit the DWARF debug info custom sections?
+dwarf-debug-info = false
+
+[package.metadata.wasm-pack.profile.profiling.wasm-bindgen]
+debug-js-glue = false
+demangle-name-section = true
+dwarf-debug-info = false
+
+[package.metadata.wasm-pack.profile.release.wasm-bindgen]
+debug-js-glue = false
+demangle-name-section = true
+dwarf-debug-info = false
+```
--- a/docs/src/commands/build.md
+++ b/docs/src/commands/build.md
@ -16,15 +16,28 @@ wasm-pack build examples/js-hello-world
 This path should point to a directory that contains a `Cargo.toml` file. If no
 path is given, the `build` command will run in the current directory.

-## Debug
+## Profile

-The init command accepts an optional `--debug` argument. This will build the
-output package using cargo's
-[default non-release profile][cargo-profile-sections-documentation]. Building
-this way is faster but applies few optimizations to the output, and enables
-debug assertions and other runtime correctness checks.
+The `build` command accepts an optional profile argument: one of `--dev`,
+`--profiling`, or `--release`. If none is supplied, then `--release` is used.

-The exact meaning of this flag may evolve as the platform matures.
+Th controls whether debug assertions are enabled, debug info is generated, and
+which (if any) optimizations are enabled.
+
+| Profile       | Debug Assertions | Debug Info | Optimizations | Notes                                 |
+|---------------|------------------|------------|---------------|---------------------------------------|
+| `--dev`       | Yes              | Yes        | No            | Useful for development and debugging. |
+| `--profiling` | No               | Yes        | Yes           | Useful when profiling and investigating performance issues. |
+| `--release`   | No               | No         | Yes           | Useful for shipping to production.    |
+
+The `--dev` profile will build the output package using cargo's [default
+non-release profile][cargo-profile-sections-documentation]. Building this way is
+faster but applies few optimizations to the output, and enables debug assertions
+and other runtime correctness checks. The `--profiling` and `--release` profiles
+use cargo's release profile, but the former enables debug info as well, which
+helps when investigating performance issues in a profiler.
+
+The exact meaning of the profile flags may evolve as the platform matures.

 [cargo-profile-sections-documentation]: https://doc.rust-lang.org/cargo/reference/manifest.html#the-profile-sections

--- a/src/bindgen.rs
+++ b/src/bindgen.rs
@ -2,6 +2,7 @@

 use binaries::{Cache, Download};
 use child;
+use command::build::BuildProfile;
 use emoji;
 use failure::{self, ResultExt};
 use manifest::CrateData;
@ -145,14 +146,17 @@ pub fn wasm_bindgen_build(
    out_dir: &Path,
    disable_dts: bool,
    target: &str,
-    debug: bool,
+    profile: BuildProfile,
    step: &Step,
    log: &Logger,
 ) -> Result<(), failure::Error> {
    let msg = format!("{}Running WASM-bindgen...", emoji::RUNNER);
    PBAR.step(step, &msg);

-    let release_or_debug = if debug { "debug" } else { "release" };
+    let release_or_debug = match profile {
+        BuildProfile::Release | BuildProfile::Profiling => "release",
+        BuildProfile::Dev => "debug",
+    };

    let out_dir = out_dir.to_str().unwrap();

@ -181,9 +185,16 @@ pub fn wasm_bindgen_build(
        .arg(dts_arg)
        .arg(target_arg);

-    if debug {
+    let profile = data.configured_profile(profile);
+    if profile.wasm_bindgen_debug_js_glue() {
        cmd.arg("--debug");
    }
+    if !profile.wasm_bindgen_demangle_name_section() {
+        cmd.arg("--no-demangle");
+    }
+    if profile.wasm_bindgen_dwarf_debug_info() {
+        cmd.arg("--keep-debug");
+    }

    child::run(log, cmd, "wasm-bindgen").context("Running the wasm-bindgen CLI")?;
    Ok(())
--- a/src/build.rs
+++ b/src/build.rs
@ -1,6 +1,7 @@
 //! Building a Rust crate into a `.wasm` binary.

 use child;
+use command::build::BuildProfile;
 use emoji;
 use failure::{Error, ResultExt};
 use progressbar::Step;
@ -62,13 +63,32 @@ pub fn rustup_add_wasm_target(log: &Logger, step: &Step) -> Result<(), Error> {
 }

 /// Run `cargo build` targetting `wasm32-unknown-unknown`.
-pub fn cargo_build_wasm(log: &Logger, path: &Path, debug: bool, step: &Step) -> Result<(), Error> {
+pub fn cargo_build_wasm(
+    log: &Logger,
+    path: &Path,
+    profile: BuildProfile,
+    step: &Step,
+) -> Result<(), Error> {
    let msg = format!("{}Compiling to WASM...", emoji::CYCLONE);
    PBAR.step(step, &msg);
    let mut cmd = Command::new("cargo");
    cmd.current_dir(path).arg("build").arg("--lib");
-    if !debug {
-        cmd.arg("--release");
+    match profile {
+        BuildProfile::Profiling => {
+            // Once there are DWARF debug info consumers, force enable debug
+            // info, because builds that use the release cargo profile disables
+            // debug info.
+            //
+            // cmd.env("RUSTFLAGS", "-g");
+            cmd.arg("--release");
+        }
+        BuildProfile::Release => {
+            cmd.arg("--release");
+        }
+        BuildProfile::Dev => {
+            // Plain cargo builds use the dev cargo profile, which includes
+            // debug info by default.
+        }
    }
    cmd.arg("--target").arg("wasm32-unknown-unknown");
    child::run(log, cmd, "cargo build").context("Compiling your crate to WebAssembly failed")?;
--- a/src/command/build.rs
+++ b/src/command/build.rs
@ -25,9 +25,8 @@ pub struct Build {
    pub scope: Option<String>,
    pub disable_dts: bool,
    pub target: String,
-    pub debug: bool,
+    pub profile: BuildProfile,
    pub mode: BuildMode,
-    // build_config: Option<BuildConfig>,
    pub out_dir: PathBuf,
    pub bindgen: Option<Download>,
    pub cache: Cache,
@ -64,6 +63,18 @@ impl FromStr for BuildMode {
    }
 }

+/// The build profile controls whether optimizations, debug info, and assertions
+/// are enabled or disabled.
+#[derive(Clone, Copy, Debug)]
+pub enum BuildProfile {
+    /// Enable assertions and debug info. Disable optimizations.
+    Dev,
+    /// Enable optimizations. Disable assertions and debug info.
+    Release,
+    /// Enable optimizations and debug info. Disable assertions.
+    Profiling,
+}
+
 /// Everything required to configure and run the `wasm-pack build` command.
 #[derive(Debug, StructOpt)]
 pub struct BuildOptions {
@ -97,6 +108,14 @@ pub struct BuildOptions {
    /// optimizations.
    dev: bool,

+    #[structopt(long = "release")]
+    /// Create a release build. Enable optimizations and disable debug info.
+    release: bool,
+
+    #[structopt(long = "profiling")]
+    /// Create a profiling build. Enable optimizations and debug info.
+    profiling: bool,
+
    #[structopt(long = "out-dir", short = "d", default_value = "pkg")]
    /// Sets the output directory with a relative path.
    pub out_dir: String,
@ -110,16 +129,25 @@ impl Build {
        let crate_path = set_crate_path(build_opts.path)?;
        let crate_data = manifest::CrateData::new(&crate_path)?;
        let out_dir = crate_path.join(PathBuf::from(build_opts.out_dir));
-        // let build_config = manifest::xxx(&crate_path).xxx();
+
+        let dev = build_opts.dev || build_opts.debug;
+        let profile = match (dev, build_opts.release, build_opts.profiling) {
+            (false, false, false) | (false, true, false) => BuildProfile::Release,
+            (true, false, false) => BuildProfile::Dev,
+            (false, false, true) => BuildProfile::Profiling,
+            // Unfortunately, `structopt` doesn't expose clap's `conflicts_with`
+            // functionality yet, so we have to implement it ourselves.
+            _ => bail!("Can only supply one of the --dev, --release, or --profiling flags"),
+        };
+
        Ok(Build {
            crate_path,
            crate_data,
            scope: build_opts.scope,
            disable_dts: build_opts.disable_dts,
            target: build_opts.target,
-            debug: build_opts.dev || build_opts.debug,
+            profile,
            mode: build_opts.mode,
-            // build_config,
            out_dir,
            bindgen: None,
            cache: Cache::new()?,
@ -227,7 +255,7 @@ impl Build {

    fn step_build_wasm(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
        info!(&log, "Building wasm...");
-        build::cargo_build_wasm(log, &self.crate_path, self.debug, step)?;
+        build::cargo_build_wasm(log, &self.crate_path, self.profile, step)?;

        info!(
            &log,
@ -302,7 +330,7 @@ impl Build {
            &self.out_dir,
            self.disable_dts,
            &self.target,
-            self.debug,
+            self.profile,
            step,
            log,
        )?;
--- a/src/lib.rs
+++ b/src/lib.rs
@ -14,6 +14,7 @@ extern crate indicatif;
 #[macro_use]
 extern crate lazy_static;
 extern crate parking_lot;
+extern crate serde;
 #[macro_use]
 extern crate serde_derive;
 extern crate serde_json;
--- a/src/manifest/mod.rs
+++ b/src/manifest/mod.rs
@ -9,9 +9,11 @@ use self::npm::{
    repository::Repository, CommonJSPackage, ESModulesPackage, NoModulesPackage, NpmPackage,
 };
 use cargo_metadata::Metadata;
+use command::build::BuildProfile;
 use emoji;
 use failure::{Error, ResultExt};
 use progressbar::Step;
+use serde::{self, Deserialize};
 use serde_json;
 use toml;
 use PBAR;
@ -34,6 +36,157 @@ struct CargoPackage {
    description: Option<String>,
    license: Option<String>,
    repository: Option<String>,
+
+    #[serde(default)]
+    metadata: CargoMetadata,
+}
+
+#[derive(Default, Deserialize)]
+struct CargoMetadata {
+    #[serde(default, rename = "wasm-pack")]
+    wasm_pack: CargoWasmPack,
+}
+
+#[derive(Default, Deserialize)]
+struct CargoWasmPack {
+    #[serde(default)]
+    profile: CargoWasmPackProfiles,
+}
+
+#[derive(Deserialize)]
+struct CargoWasmPackProfiles {
+    #[serde(
+        default = "CargoWasmPackProfile::default_dev",
+        deserialize_with = "CargoWasmPackProfile::deserialize_dev"
+    )]
+    dev: CargoWasmPackProfile,
+
+    #[serde(
+        default = "CargoWasmPackProfile::default_release",
+        deserialize_with = "CargoWasmPackProfile::deserialize_release"
+    )]
+    release: CargoWasmPackProfile,
+
+    #[serde(
+        default = "CargoWasmPackProfile::default_profiling",
+        deserialize_with = "CargoWasmPackProfile::deserialize_profiling"
+    )]
+    profiling: CargoWasmPackProfile,
+}
+
+impl Default for CargoWasmPackProfiles {
+    fn default() -> CargoWasmPackProfiles {
+        CargoWasmPackProfiles {
+            dev: CargoWasmPackProfile::default_dev(),
+            release: CargoWasmPackProfile::default_release(),
+            profiling: CargoWasmPackProfile::default_profiling(),
+        }
+    }
+}
+
+/// This is where configuration goes for wasm-bindgen, wasm-opt, wasm-snip, or
+/// anything else that wasm-pack runs.
+#[derive(Default, Deserialize)]
+pub struct CargoWasmPackProfile {
+    #[serde(default, rename = "wasm-bindgen")]
+    wasm_bindgen: CargoWasmPackProfileWasmBindgen,
+}
+
+#[derive(Default, Deserialize)]
+struct CargoWasmPackProfileWasmBindgen {
+    #[serde(default, rename = "debug-js-glue")]
+    debug_js_glue: Option<bool>,
+
+    #[serde(default, rename = "demangle-name-section")]
+    demangle_name_section: Option<bool>,
+
+    #[serde(default, rename = "dwarf-debug-info")]
+    dwarf_debug_info: Option<bool>,
+}
+
+impl CargoWasmPackProfile {
+    fn default_dev() -> Self {
+        CargoWasmPackProfile {
+            wasm_bindgen: CargoWasmPackProfileWasmBindgen {
+                debug_js_glue: Some(true),
+                demangle_name_section: Some(true),
+                dwarf_debug_info: Some(false),
+            },
+        }
+    }
+
+    fn default_release() -> Self {
+        CargoWasmPackProfile {
+            wasm_bindgen: CargoWasmPackProfileWasmBindgen {
+                debug_js_glue: Some(false),
+                demangle_name_section: Some(true),
+                dwarf_debug_info: Some(false),
+            },
+        }
+    }
+
+    fn default_profiling() -> Self {
+        CargoWasmPackProfile {
+            wasm_bindgen: CargoWasmPackProfileWasmBindgen {
+                debug_js_glue: Some(false),
+                demangle_name_section: Some(true),
+                dwarf_debug_info: Some(false),
+            },
+        }
+    }
+
+    fn deserialize_dev<'de, D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        let mut profile = <Option<Self>>::deserialize(deserializer)?.unwrap_or_default();
+        profile.update_with_defaults(Self::default_dev());
+        Ok(profile)
+    }
+
+    fn deserialize_release<'de, D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        let mut profile = <Option<Self>>::deserialize(deserializer)?.unwrap_or_default();
+        profile.update_with_defaults(Self::default_release());
+        Ok(profile)
+    }
+
+    fn deserialize_profiling<'de, D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        let mut profile = <Option<Self>>::deserialize(deserializer)?.unwrap_or_default();
+        profile.update_with_defaults(Self::default_profiling());
+        Ok(profile)
+    }
+
+    fn update_with_defaults(&mut self, defaults: Self) {
+        macro_rules! d {
+            ( $( $path:ident ).* ) => {
+                self. $( $path ).* .get_or_insert(defaults. $( $path ).* .unwrap());
+            }
+        }
+        d!(wasm_bindgen.debug_js_glue);
+        d!(wasm_bindgen.demangle_name_section);
+        d!(wasm_bindgen.dwarf_debug_info);
+    }
+
+    /// Get this profile's configured `[wasm-bindgen.debug-js-glue]` value.
+    pub fn wasm_bindgen_debug_js_glue(&self) -> bool {
+        self.wasm_bindgen.debug_js_glue.unwrap()
+    }
+
+    /// Get this profile's configured `[wasm-bindgen.demangle-name-section]` value.
+    pub fn wasm_bindgen_demangle_name_section(&self) -> bool {
+        self.wasm_bindgen.demangle_name_section.unwrap()
+    }
+
+    /// Get this profile's configured `[wasm-bindgen.dwarf-debug-info]` value.
+    pub fn wasm_bindgen_dwarf_debug_info(&self) -> bool {
+        self.wasm_bindgen.dwarf_debug_info.unwrap()
+    }
 }

 struct NpmData {
@ -88,6 +241,15 @@ impl CrateData {
        }
    }

+    /// Get the configured profile.
+    pub fn configured_profile(&self, profile: BuildProfile) -> &CargoWasmPackProfile {
+        match profile {
+            BuildProfile::Dev => &self.manifest.package.metadata.wasm_pack.profile.dev,
+            BuildProfile::Profiling => &self.manifest.package.metadata.wasm_pack.profile.profiling,
+            BuildProfile::Release => &self.manifest.package.metadata.wasm_pack.profile.release,
+        }
+    }
+
    /// Check that the crate the given path is properly configured.
    pub fn check_crate_config(&self, step: &Step) -> Result<(), Error> {
        let msg = format!("{}Checking crate configuration...", emoji::WRENCH);
--- a/tests/all/build.rs
+++ b/tests/all/build.rs
@ -1,3 +1,4 @@
+use std::fs;
 use std::path::Path;
 use structopt::StructOpt;
 use utils;
@ -138,3 +139,92 @@ fn it_should_build_nested_project_with_transitive_dependencies() {
    .unwrap();
    fixture.run(cli.cmd).unwrap();
 }
+
+#[test]
+fn build_different_profiles() {
+    let fixture = utils::fixture::js_hello_world();
+    fixture.install_local_wasm_bindgen();
+
+    for profile in ["--dev", "--debug", "--profiling", "--release"]
+        .iter()
+        .cloned()
+    {
+        let cli = Cli::from_iter_safe(vec![
+            "wasm-pack",
+            "build",
+            profile,
+            &fixture.path.display().to_string(),
+        ])
+        .unwrap();
+        fixture.run(cli.cmd).unwrap();
+    }
+}
+
+#[test]
+fn build_with_and_without_wasm_bindgen_debug() {
+    for debug in [true, false].iter().cloned() {
+        let fixture = utils::fixture::Fixture::new();
+        fixture
+            .readme()
+            .file(
+                "Cargo.toml",
+                format!(
+                    r#"
+                    [package]
+                    authors = ["The wasm-pack developers"]
+                    description = "so awesome rust+wasm package"
+                    license = "WTFPL"
+                    name = "whatever"
+                    repository = "https://github.com/rustwasm/wasm-pack.git"
+                    version = "0.1.0"
+
+                    [lib]
+                    crate-type = ["cdylib"]
+
+                    [dependencies]
+                    wasm-bindgen = "0.2"
+
+                    [package.metadata.wasm-pack.profile.dev.wasm-bindgen]
+                    debug-js-glue = {}
+                    "#,
+                    debug
+                ),
+            )
+            .file(
+                "src/lib.rs",
+                r#"
+                extern crate wasm_bindgen;
+                use wasm_bindgen::prelude::*;
+
+                #[wasm_bindgen]
+                pub struct MyThing {}
+
+                #[wasm_bindgen]
+                impl MyThing {
+                    pub fn new() -> MyThing {
+                        MyThing {}
+                    }
+
+                    pub fn take(self) {}
+                }
+                "#,
+            );
+
+        let cli = Cli::from_iter_safe(vec![
+            "wasm-pack",
+            "build",
+            "--dev",
+            &fixture.path.display().to_string(),
+        ])
+        .unwrap();
+
+        fixture.run(cli.cmd).unwrap();
+
+        let contents = fs::read_to_string(fixture.path.join("pkg/whatever.js")).unwrap();
+        assert_eq!(
+            contents.contains("throw new Error('Attempt to use a moved value')"),
+            debug,
+            "Should only contain moved value assertions when debug assertions are enabled"
+        );
+    }
+}
--- a/tests/all/manifest.rs
+++ b/tests/all/manifest.rs
@ -2,8 +2,10 @@ use std::collections::HashSet;
 use std::fs;
 use std::path::PathBuf;

+use structopt::StructOpt;
+
 use utils::{self, fixture};
-use wasm_pack::{self, manifest};
+use wasm_pack::{self, manifest, Cli};

 #[test]
 fn it_gets_the_crate_name_default_path() {
@ -286,3 +288,48 @@ fn it_does_not_error_when_wasm_bindgen_is_declared() {
    let step = wasm_pack::progressbar::Step::new(1);
    crate_data.check_crate_config(&step).unwrap();
 }
+
+#[test]
+fn configure_wasm_bindgen_debug_incorrectly_is_error() {
+    let fixture = utils::fixture::Fixture::new();
+    fixture
+        .readme()
+        .file(
+            "Cargo.toml",
+            r#"
+            [package]
+            authors = ["The wasm-pack developers"]
+            description = "so awesome rust+wasm package"
+            license = "WTFPL"
+            name = "whatever"
+            repository = "https://github.com/rustwasm/wasm-pack.git"
+            version = "0.1.0"
+
+            [lib]
+            crate-type = ["cdylib"]
+
+            [dependencies]
+            wasm-bindgen = "0.2"
+
+            [package.metadata.wasm-pack.profile.dev.wasm-bindgen]
+            debug-js-glue = "not a boolean"
+            "#,
+        )
+        .hello_world_src_lib();
+
+    let cli = Cli::from_iter_safe(vec![
+        "wasm-pack",
+        "build",
+        "--dev",
+        &fixture.path.display().to_string(),
+    ])
+    .unwrap();
+
+    let result = fixture.run(cli.cmd);
+    assert!(result.is_err());
+
+    let err = result.unwrap_err();
+    assert!(err.iter_chain().any(|c| c
+        .to_string()
+        .contains("package.metadata.wasm-pack.profile.dev.wasm-bindgen.debug")));
+}